Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b4024da4081d0f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 15:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aeebf755e0e5865c87f5708792cba57c SHA-1: 325f831387f4aa6da1c774fc5ee389a5d1d00533 SHA-256: 62b4024da4081d0f1c5449e7e97a0833edea90e48433ead1448562d7ba40d563
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, including compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sage-chem.com/image/files/20210903_141316.pdf In PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109131526093053.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161307b74482bb---xosetowisixerafo.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091004265670554.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/jopavexa.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/kivafakafitew.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/75367642356.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/67471280843.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/39597483709.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/89999398235.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9e08311aad8cf65491a5a262e586afba/mivopexonakupibobup.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e4535331081b96b44aea6edcb04be1c7/98704868833.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/talawezotuzedebefutomeso.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/38811068970.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/fizepofumerimasujagudovid.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/47823014860.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/21898625471.pdfIn PDF document text
    • https://slide-bearing.com/d/files/valolaxemewozajago.pdfIn PDF document text
    • https://designclarf.it/file/41350655508.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/punibimadumonakir.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091100471934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hunter+x+hunter+greed+island+arc+episodesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 10984 bytes
SHA-256: 3341c725080712c11ceb40e52964456c0e32ff0e5d10b3747235a66bf75bf4b8
font_02_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 16832 bytes
SHA-256: 9c3d959670d60a7aa77f24719e370b72dd21e367686806c2e84584c2ba70ef48

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